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<?php $a = [1,2,3]; $coverageList = [1=>0]; var_dump(array_flip($a)); var_dump($coverageList); var_dump(array_diff_key(array_flip($a), $coverageList)); ?>
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [1]=> int(0) [2]=> int(1) [3]=> int(2) } array(1) { [1]=> int(0) } array(2) { [2]=> int(1) [3]=> int(2) }

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